EN 61773:1996
(Main)Overhead lines - Testing of foundations for structures
Overhead lines - Testing of foundations for structures
Is applicable to the testing procedures for foundations of overhead line structures.
Freileitungen - Prüfung von Gründungen für Bauwerke
Lignes aériennes - Essais de fondations des supports
Est applicable aux procédures d'essais pour les fondations des supports de lignes aériennes.
Nadzemni vodi - Preskusi temeljev za nosilne konstrukcije (IEC 1773:1996)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-1999
Nadzemni vodi - Preskusi temeljev za nosilne konstrukcije (IEC 1773:1996)
Overhead lines - Testing of foundations for structures
Freileitungen - Prüfung von Gründungen für Bauwerke
Lignes aériennes - Essais de fondations des supports
Ta slovenski standard je istoveten z: EN 61773:1996
ICS:
29.240.20 Daljnovodi Power transmission and
distribution lines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
NORME
CEI
INTERNATIONALE
IEC
INTERNATIONAL
Première édition
STANDARD
First edition
1996-11
Lignes aériennes –
Essais de fondations des supports
Overhead lines –
Testing of foundations for structures
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1773 © IEC:1996 − 3 −
CONTENTS
Page
FOREWORD . 7
Clause
1 Scope and object. 9
2 Normative references . 9
3 Definitions . 11
4 Categories of tests . 11
4.1 Design tests . 11
4.2 Proof tests. 13
5 Geotechnical data. 15
5.1 General . 15
5.2 Soil investigation results . 15
5.3 Geotechnical design parameters . 15
5.4 Soil conditions during foundation installation . 15
6 Foundation installation. 17
6.1 General . 17
6.2 Variations on foundations for design tests . 17
6.3 Installation techniques for foundations subject to design testing. 17
6.4 Installation records . 19
6.5 Minimum period of time required between installation and testing . 19
7 Test equipment. 21
7.1 Load application . 21
7.2 Test loading arrangements. 23
7.3 Reference beam – Design tests . 25
7.4 Displacement measurement devices – Design tests. 25
7.5 Displacement measurement devices – Proof tests . 27
7.6 Calibration of measuring instruments . 27
8 Test procedure . 41
8.1 Number of tests . 41
8.2 Testing of pile groups . 41
8.3 Loading procedure. 43
8.4 Test recording . 45
9 Test evaluation. 47
9.1 General . 47
9.2 Design tests . 47
9.3 Proof tests. 49
1773 © IEC:1996 − 5 −
Clause Page
10 Acceptance criteria . 49
10.1 General. 49
10.2 Design tests . 49
10.3 Proof tests. 51
11 Test report . 51
Annexes
A Bibliography . 53
B Soil investigations. 55
C Comments on clear horizontal distance between reaction supports
and test foundation. 61
D Formats for records of installation and testing . 67
E Guidance notes for graphical determination of foundation uplift or
compression capacity . 77
F Glossary of terms and explanations . 87
1773 © IEC:1996 − 7 −
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OVERHEAD LINES –
TESTING OF FOUNDATIONS FOR STRUCTURES
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international co-operation on all questions concerning standardization in the electrical and electronic
fields. To this end and in addition to other activities, the IEC publishes International Standards. Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt
with may participate in this preparatory work. International, governmental and non-governmental organizations
liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the
form of standards, technical reports or guides and they are accepted by the National Committees in that
sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the
subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 1773 has been prepared by IEC technical committee 11: Overhead
lines.
The text of this standard is based on the following documents:
FDIS Report on voting
11/111/FDIS 11/117/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
Annexes A, B, C, D, E and F are for information only.
The contents of the corrigendum of March 1997 have been included in this copy.
1773 © IEC:1996 − 9 −
OVERHEAD LINES –
TESTING OF FOUNDATIONS FOR STRUCTURES
1 Scope and object
This International Standard is applicable to the testing procedures for foundations of overhead
line structures. This standard distinguishes between:
a) foundations predominantly loaded by axial forces, either in uplift or compression, acting in
the direction of the foundation central axis. This applies to foundations of rigid lattice towers
with typical individual footings, that is concrete pad and chimney foundations, steel grillages,
concrete piers, piles and grouted anchors. Guy (stay) foundations are included when they
are tested in line with their true guy inclinations;
b) foundations predominantly loaded by lateral forces, overturning moments, or a
combination of both. This applies to single poles with typical compact foundations, for
example monoblock foundations, concrete slabs, concrete piers, piles and poles directly
embedded in the ground. It may also apply to H-frame structure foundations for which the
predominant loads are lateral forces, overturning moments, or a combination of both;
c) foundations loaded by a combination of forces mentioned under a) and b).
Tests on reduced scale or model foundations are not included. However, they may be useful for
design purposes.
Dynamic foundation testing is excluded from the scope of this document.
The object of this standard is to provide procedures which apply to the investigation of the load-
carrying capacity and/or the load response (deflection or rotation) of the total foundation as an
interaction between the foundation and the surrounding soil and/or rock. The mechanical
strength of the structural components is not within the object of this standard. However, in the
case of grouted anchors, the failure of structural components, for example the bond between
anchor rod and grout, may predominate.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this International Standard. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to
agreements based on this International Standard are encouraged to investigate the possibility
of applying the most recent editions of the normative documents indicated below. Members of
IEC and ISO maintain registers of currently valid International Standards.
IEC 50(466): 1990, International Electrotechnical Vocabulary (IEV) – Chapter 466: Overhead
lines
IEC 826: 1991, Loading and strength of overhead transmission lines
1773 © IEC:1996 − 11 −
3 Definitions
For the purpose of this International Standard, the following definitions apply. The definitions
listed below supplement those given in IEC 50(466).
3.1 characteristic strength: The value guaranteed in appropriate standards. This value is
also called the guaranteed strength, the minimum strength, the minimum failing load or the
nominal strength and usually corresponds to an exclusion limit, from 2 % to 5 %, with 10 %
being, in practice, the upper limit (IEC 826, 1.2.1).
3.2 damage or serviceability limit load: The load corresponding to the strength limit of the
foundation, which, if exceeded, will lead to damage and noticeable deformation or reduction in
strength of the supported structure. The damage load is normally related to displacement
criteria and may also be known as the serviceability limit load.
NOTE – When applying this standard to testing foundations which are designed using deterministic loading
criteria, reference to this term may be necessary.
3.3 design load: The limit load or factored working load or the load derived with respect to a
specific return period of a climatical event, for which the foundation has been designed.
3.4 failure load: The maximum load which can be applied during testing. It is also known as
the limit state failure load and is usually associated with displacements leading to failure of the
structure.
3.5 maximum proof load: The maximum load applied to the foundation tested during a proof
test.
3.6 test report: Final document summarizing the results of investigations and foundation
tests.
3.7 working load: The maximum load likely to be experienced by the foundation under
normal working conditions, during the life of the line, with no overload factors included.
NOTE – The term working load does not apply to limit states design methods and is not compatible with
IEC 826. However, when applying this standard to testing foundations which are designed using deterministic
loading criteria, reference to this term may be necessary.
4 Categories of tests
With respect to the purpose of the test, the level of investigation and the method of execution,
this standard refers to two categories of tests:
a)
...
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